JPH0330690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a heat exchange core for a heat exchanger such as an oil cooler for an internal combustion engine.

(Prior Art) Conventionally, an annular multi-plate type oil cooler for an internal combustion engine is known, which has a central opening through which a mounting bolt is inserted. For example, special public service in 1977-
Disclosed in No. 48238. An example is shown in FIG. The oil cooler 30 is the cooling water inlet pipe 3
2. A cooler core 34 is housed inside a cylindrical casing 31 equipped with a cooling water outlet pipe 33 and communicated with an oil inlet 35 and an oil outlet 36. The cooler core 34 has a cooler unit 39 that accommodates fins 37 and is separated from a center opening by a collar 38, and spacer plates 40 stacked alternately.

The above-mentioned heat exchanger requires a spacer plate in the cooler core, and also requires a casing, so it is large and heavy, and has a large number of parts. Therefore, in 1983,
A laminated type oil cooler that does not use a casing, such as the oil cooler disclosed in No. 28219, has been proposed. This oil cooler combines a pair of upper and lower plates, which are stacked in a required number of stages, and has a lower end plate on the lower surface, a ring-shaped member serving as an oil outflow chamber on the upper surface, and a cooling water inlet. It has an outlet pipe attached. The bottom walls of the upper and lower plates each form a step, and are provided with a stepped portion, a convex portion, and the like. When the upper plate and the lower plate are combined and stacked on top of each other, the stepped convex portions provided on the bottom wall and the spaces between the stepped portions become fluid flow paths. Further, the vertically protruding portions provided on the bottom wall are brought into contact with each other, and the rising portion forms a boundary between the two fluids, and the abutting surface becomes a contact surface between the upper and lower similar fluids.

(Problems to be Solved by the Invention) Among the heat exchangers as described above, the former requires a casing, has a large number of parts, is large and heavy, and requires a large number of assembly steps. The latter requires a set of two types of upper and lower plates, and the bottom wall of each must be stepped to provide a stepped portion or a convex portion. These upper and lower plates are usually manufactured by press-forming metal plates, so the steps and protrusions mentioned above must be accurately stepped to ensure that they are flat and free of warping. Difficult to mold. Therefore, when they are overlapped, gaps may occur in the portions that should be in close contact, resulting in leaks due to poor soldering, or the shape of the flow path may become inaccurate, resulting in greater fluid pressure loss than expected. Furthermore, the portion where the bottom wall protrudes and abuts becomes a contact surface between fluids of the same type, so the heat transfer area of the bottom wall is reduced by the area of contact.

(Means for Solving the Problems) In this invention, a single plate with no steps is used on the bottom wall, and by overlapping these plates with displacement in the circumferential direction, a heat exchange core is formed in which the flow paths of two fluids are divided. It is something that makes you That is, upright flanges are provided on the periphery of the bottom wall and the periphery of the central opening in the center of the bottom wall, and an even number of openings are provided on the concentric circle of the bottom wall at equal pitches, and an opening flange is provided every other opening to form a plate, These plates are stacked one on top of the other, shifted one pitch at a time, to form alternately layered first and second channels, and upper and lower end plates are fixed to the upper and lower ends of these plates, and either of the upper or lower end plates is , a heat exchange core of a heat exchanger including a first inlet and a first outlet communicating with the first flow path, and a second inlet and a second outlet communicating with the second flow path.

(Function) An inlet chamber, an outlet chamber, an inlet pipe, an outlet pipe, which communicate with the first and second fluid inlets and outlets provided in the upper end plate and the lower end plate, are attached to this heat exchange core. Form a heat exchanger. The two fluids flow in from these inlet chambers or inlet pipes, branch into flow channels every other layer, and the branched flows of each layer come together again. During this time, heat exchange is performed for each layer via the bottom wall, and the flow passes through the outlet. flows out from.

Since the plates of this heat exchange core are made by simply overlapping plates of a single shape, the structure is simple and easy to manufacture. Further, since the bottom wall of the plate does not need to be provided with stepped irregularities, it can be finished flat without warping, and when stacked, the flanges are in a good joint state and do not create gaps. In addition, the entire area of the bottom wall, excluding the opening, serves as an interface between the two fluids in the upper and lower layers, and acts as a heat transfer surface.

(Example) An example will be described with reference to FIGS. 1 to 4. FIGS. 1 and 2 show the heat exchange core 25 (third part) of the present invention.
4). The plate 2 is provided with a rising flange 4b on the periphery of a circular flat bottom wall 5 having a central opening 3 in the center, and a rising flange 4a on the periphery of the central opening 3. Eight openings 6 are bored on a circle 7 concentric with the central opening 3 at equal pitches P of 45° each. The openings 6 have openings 6a provided with an opening flange 8 on the periphery and openings 6b without an opening flange arranged alternately. With the plates 2 in a face down position, shift the pitch by 45 degrees and overlap the required number of plates to form the rising flange 4a.
4b are joined to each other, and the opening flange 8 is joined to the periphery of the opening 6b. In this way, the layered cavities formed between the bottom walls 5 by the rows of opening flanges 8 arranged in the vertical direction are communicated every other layer, and the first inflow passage 10 and the first outflow passage are connected to each other. 11 (FIG. 3) and a second inflow channel 1
2. Second flow path with second outflow passage 13 (Fig. 4)
is formed. In this example, first and second inflow passages,
Two first and second outflow passages are formed. An upper end plate 9 having a central opening 9b on the upper end face and a first outlet 9a facing the first outflow passage 11 is fixed to the plates 2 stacked in this way, and a central opening 15a on the lower end face of these plates 2. , a lower end plate 15 having a first inlet 15b, a second inlet 15c, and a second outlet 15d is fixed to form a heat exchange core 25. In the example shown in FIGS. 3 and 4, a cylindrical hanging part 15e is provided on the periphery of the lower end plate 15, and a lower lid 21 is stacked on the inside of the cylindrical hanging part 15e.
5e, a second fluid inlet chamber 17 and a second fluid outlet chamber 18 are formed. An inlet pipe 19 and an outlet pipe 20 are attached to the inlet and outlet chambers of the second fluid, and communicate with the second inlet 15c and the second outlet 15d. The lower surface of the lower lid 21 forms the first fluid inlet chamber 16 and communicates with the first inlet 15b. Upper end plate 9
A ring-shaped upper chamber 14 having an opening 14a is attached to the upper surface of the chamber, and the inside thereof forms a first fluid outlet chamber and communicates with the first outlet 9a. The heat exchanger 1 thus constructed is an oil cooler in which the first fluid is oil and the second fluid is cooling water.

Other examples of plates are shown in FIGS. 5 and 6. The plate 32 has an opening 36 in the bottom wall 35 with a central opening.
A and 36b are arranged alternately at a 90° pitch on a circle concentric with the center opening. The opening 36a is provided with an opening flange 38, and the opening 36b is not provided with an opening flange. Further, a plurality of protrusions 37 are provided on the bottom wall 35. The projections 37 are arranged so that the positions of the illustrated 90° pitch region P ₁ and the adjacent 90° pitch region P ₂ do not correspond. 1 pitch of plate 32
When they are shifted by 90 degrees and overlapped, the protrusions 37 in the P ₁ area and the protrusions 37 in the P ₂ area abut against the bottom wall 35 of the adjacent plate 32 without overlapping. The protrusion 37 causes turbulence in the fluid flowing between the openings 36b, 36b in the cavity, thereby improving heat exchange efficiency. In addition, it acts as a support to maintain the distance between the bottom walls 35, increasing the pressure resistance against high-pressure fluid. The longitudinal section of the heat exchange core constructed by overlapping the plates 32 is similar to that shown in FIGS. 3 and 4.

Further examples of other plates are shown in FIGS. 7 and 8. 42 has openings 45a, 45b and 46a, 46b on two concentric circles 47a, 47b.
They are provided at a pitch of 180°, and opening flanges are provided at 45a and 46a. Openings 45a, 45b, 4
6a and 46b are arranged on the same diameter. Further, a plurality of protrusions 37 are provided at positions that do not correspond to each other at a pitch of 180°. When the plates 42 are stacked one on top of the other with a 180° offset by one pitch and the upper and lower end plates are fixed in the same manner as in FIGS. 3 and 4, the heat exchange core of the present invention shown in cross section in FIG. 9 is obtained. FIG. 9 shows a heat exchanger 41 using this heat exchange core. plate 3
As shown in FIG. 9, the heat exchange core using 2 has a first inflow passage, a first outflow passage, a second inflow passage,
A second outflow passage appears on the same longitudinal section, and the fluid flows approximately half a circle between the openings 45b and 46b in the cavities of each layer, dividing into left and right sides.

(Effects of the Invention) The heat exchange core of this invention has a structure in which a single plate is superimposed and the upper and lower end plates are fixed, and the plate has a flat bottom wall and no stepped irregularities, so the structure is simple and easy to manufacture. It is. Furthermore, since the bottom wall of the plate is flat and the shape is simple, accurate dimensions can be obtained, and the upright flanges, openings, and flanges will have perfect adhesion when joined. Therefore, a heat exchanger with guaranteed functionality without brazing leakage etc. can be obtained. In addition, since the entire area of the bottom wall of the plate, excluding the opening, is a heat transfer surface, it has good heat exchange efficiency, can be made compact, has a simple structure, has a small number of parts, and has the effect of being lightweight. . Furthermore, if the heat transfer area is increased by increasing the number of laminated plates, the fluid flow path will not become longer and the cross-sectional area of the flow path will increase, which is an advantageous structure in that pressure loss will be reduced.

[Brief explanation of drawings]

Fig. 1 is a plan view of the plate of the present invention, Fig. 2 is a sectional view along the line of Fig. 1, Figs. 3 and 4 are sectional views showing the embodiment, and Fig. 5 is a plan view of another plate. , FIGS. 6A and 6B are cross-sectional views taken along lines E-I and Ro-Ro in FIG. 5. FIG. 7 is a plan view of another plate, FIG. FIG. 10 is a sectional view showing a conventional heat exchanger. 2, 32, 42... plate, 4a, 4b...
Rising flange, 5, 35...Bottom wall, 6, 6a,
6b, 36a, 36b, 46a, 46b... opening, 8, 38... opening flange, 9... upper end plate,
15...Lower end plate, 37...Protrusion.

Claims (1)

[Scope of Claims] 1. A rising flange is provided at the periphery of the bottom wall and a periphery of the central opening provided at the center of the bottom wall, and an even number of openings are provided at equal pitches on a circle concentric with the central opening, and Plates each having an opening flange on the periphery of every other opening are stacked one on top of the other, shifted by one pitch in the circumferential direction, and the flanges on the bottom wall periphery and the center opening periphery are respectively joined, and each opening flange is overlapped. It is joined to the opening periphery of adjacent plates to form first and second channels that communicate every other layer between the bottom walls of each plate, and an upper end plate and a lower end plate are fixed to the upper and lower end surfaces of the first and second flow channels. A heat exchange core of a heat exchanger in which a first inlet and a first outlet communicating with a passage, and a second inlet and a second outlet communicating with a second passage are provided in either an upper end plate or a lower end plate. . 2. The heat exchange core of the heat exchanger according to claim 1, wherein the outer shape of the bottom wall and the central opening are circular. 3 A claim in which a plurality of protrusions are provided on the bottom wall of the plate, the protrusions are arranged in positions that do not correspond to the protrusions in adjacent pitch areas, and are brought into contact with the bottom wall of the upper or lower plate. A heat exchange core of the heat exchanger according to item 1. 4. The heat exchange core of the heat exchanger according to claim 1, wherein a plurality of concentric circles each having an even number of openings are provided, and the same number of openings are provided on each concentric circle. 5 Two openings are provided on two concentric circles, and the four openings are arranged on the same diameter,
A heat exchange core for a heat exchanger according to claim 4, wherein the two open flanges are arranged on opposite sides of the center.